Vehicle & Technical > Defender

Thermostat or Muff needed?

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Suvvey:
Well it's thick in snow outside and the temperature is not getting much above freezing but unfortunately neither is the motor :-. Noticed that since the temperature has plumetted outside I am struggling to get the needle out of the cold white line. The only time this has been able to move off the line is whilst travelling over 50mph on the clear roads and only if able to do this uninterupted. As soon as I slow to below 40mph it drops right back down again :? Obviously being a draughty defender the heater struggles at the best of times but It's barely thawing inside at the moment.

I checked that the fan coupling is letting it free wheel and it is so I'm guessing this is either the Thermostat stuck open or maybe even just to be expected and time to make up a muff for the front? But surely this is more likely the thermostat as what would happen if it really was cold out there (-4 to 0 out there now)?

suggs:
i take it you have a tdi, its pretty normal for this weather mines the same, i checked my state and its working fine and dumped the coolant and have filled with new antifreeze no airlocks etc nd still runs cold. i asked this on another forum and most tdi owners said theres were the same...

Suvvey:
Yes, it's a 200tdi. Only replaced the thermostat, pump and coolant 6 months ago so was a bit anoyed that maybe the stat had gone already. Guess this means I'm going to be cutting up some old carpet tonight then :roll:

trecfive:
Remove the cooling fan and carry it in the back(with the spanner)that will improve it a bit more,when it warms up outside put it back on again, put a post-it note on the dash to remind you if you tow anything to replace the fan.

Range Rover Blues:
It's simply that your enghine is nit burning enough fuel to keep warm, or put another way your heater is that efficient it overcools the engine.  The radiator is probably not even getting warm.

I had the same in my Cavalier, It was toasty and warm blasting to Hull every day but when I hit the traffic it would cool down significantly by the time I got to work.  In traffic the 'rad barley got warm.

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